One-piece nipple and cap



FIG. 1 is a front, top and side perspective view of the one-piece nipple and cap showing my new design;

FIG. 2 is a front elevational view thereof, with the rear and both sides being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a one-piece nipple and cap, as shown and described. 